Most colleges switches are 251, 252, 253 on each subnet.

Wiess's switches:
1st::Rm 116 Wsw-wic-116192.168.255.1
1st::Rm 131 Ssw-wic-131192.168.255.3
1st::Rm 141B Esw-wic-141b192.168.255.6
2nd::Rm 216 Wsw-wic-216192.168.255.8
2nd::Rm 230B Ssw-wic-230b192.168.255.10
2nd::Rm 241B Esw-wic-241b192.168.255.11
3rd::Rm 316 Wsw-wic-316192.168.255.12
3rd::Rm 330B Ssw-wic-330b192.168.255.13
3rd::Rm 341B Esw-wic-341b192.168.255.16
4th::Rm 416 Wsw-wic-416192.168.255.17
4th::Rm 430B Ssw-wic-430b192.168.255.18
4th::Rm 441B Esw-wic-441b192.168.255.19

These can be determined dynamically as follows (quoted from Wyman):

% nslookup | egrep sw-wic | egrep -v -- -u
server moe
ls 255.168.192.in-addr.arpa
exit
 1                              host = sw-wic-116.rice.edu
 3                              host = sw-wic-131.rice.edu
 6                              host = sw-wic-141b.rice.edu
 8                              host = sw-wic-216.rice.edu
 10                             host = sw-wic-230b.rice.edu
 11                             host = sw-wic-241b.rice.edu
 12                             host = sw-wic-316.rice.edu
 13                             host = sw-wic-330b.rice.edu
 16                             host = sw-wic-341b.rice.edu
 17                             host = sw-wic-416.rice.edu
 18                             host = sw-wic-430b.rice.edu
 19                             host = sw-wic-441b.rice.edu
%